<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">DEPARTMENT OF COMPUTER SCIENCE - TALK</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Date: Thursday, November 1, 2007</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Time: 12:00 noon</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Place: Ryerson 251</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">-------------------------------------------</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Speaker: IAN WITTEN</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">From: University of Waikato, New Zealand</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Web page: <FONT class="Apple-style-span" color="#00669A" face="Verdana" size="3"><SPAN class="Apple-style-span" style="font-size: 11px;"><A href="http://www.cs.waikato.ac.nz/~ihw/">http://www.cs.waikato.ac.nz/~ihw/</A></SPAN></FONT></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><BR class="khtml-block-placeholder"></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Title: Finding documents and reading them: Keyphrase indexing, Topic browsing, Realistic books</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Abstract: My research group in New Zealand is working on several projects in information retrieval. I will present an algorithm for automatically extracting keyphrases that uses machine learning to determine the most significant phrases in a document based on their statistical, syntactic, and semantic properties. I will describe a novel interface for interactive query expansion that uses a thesaurus derived from Wikipedia to bridge the terminology of the user's query and the terminology used within documents. Finally I will demonstrate a realistic three-dimensional book-style visualization of documents in a digital library collection. Physical book models offer readers something beyond traditional computer-based paging or scrolling systems, and can be enhanced with metadata to further enrich the browsing experience.</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Bio: Ian H. Witten is Professor of Computer Science at the University of Waikato in New Zealand where he directs the New Zealand Digital Library research project. His research interests include information retrieval, machine learning, text compression, and programming by demonstration. He has published widely in these areas, including several books, the most recent being Managing Gigabytes (1999), How to build a digital library (2003), Data Mining (2005) and Web Dragons (2007), all from Morgan Kaufmann. He received an MA in mathematics from Cambridge University, England; an MSc in computer science from the University of Calgary, Canada; and a PhD in electrical engineering from Essex University, England. He is a fellow of the ACM and of the Royal Society of New Zealand. He received the 2004 IFIP Namur Award, a biennial honour accorded for “outstanding contribution with international impact to the awareness of social implications of information and communication technology” and the 2005 SIGKDD Service Award for “an outstanding contribution to the data mining field” and in 2006 the Royal Society of New Zealand Hector Medal for “an outstanding contribution to the advancement of the mathematical and information sciences.”</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">-------------------------------------------------------</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Host: Ian Foster</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">People in need of assistance should call 773-834-8977 in advance.</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">For information on future CS talks: <A href="http://www.cs.uchicago.edu/events"><FONT class="Apple-style-span" color="#0000FA">http://www.cs.uchicago.edu/events</FONT></A></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR class="khtml-block-placeholder"></DIV></BODY></HTML>